7.81=2(r+1.1)+1.21

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Solution for 7.81=2(r+1.1)+1.21 equation: 



7.81=2(r+1.1)+1.21

We move all terms to the left:

7.81-(2(r+1.1)+1.21)=0



We calculate terms in parentheses: -(2(r+1.1)+1.21), so:

2(r+1.1)+1.21

We multiply parentheses

2r+2.2+1.21

We add all the numbers together, and all the variables

2r+3.41

Back to the equation:

-(2r+3.41)



We get rid of parentheses

-2r-3.41+7.81=0

We add all the numbers together, and all the variables

-2r+4.4=0

We move all terms containing r to the left, all other terms to the right

-2r=-4.4

r=-4.4/-2

r=2+0.4/2

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